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<br /> - -- .- 'I
<br /> I, ..\"-....l
<br /> .L "-J ..) ....
<br /> Table 3
<br /> DIVERSIONS LESS MEASURED RETURNS
<br /> FOR MAJOR WATER USERS
<br /> LOWER COLORADO RIVER
<br /> 1968 la 1972
<br /> (Thausands af Acre-Feet)
<br /> Ware'T Year
<br /> CaliFornia 1968 1969 1970 1971 1971
<br />Metropolitan Water
<br />Dist. .......... 1,105 1.139 1,205 1,204 1,246
<br />Palo Verde lrrig.
<br />Dist. ...........,............ 387 386 384 457 471
<br />Imperial Irrig. Din. 2,745 2,766 2,751 2.935 2,998
<br />Coachella Valley Co.
<br />Water Dist. %9 490 448 453 495
<br />Yuma Project,
<br />Reserv. Div. ............ 56 65 48 51 47
<br />Total......... 4,762 4,846 4.836 5,100 5,257
<br /> Arizona
<br />Colorado Riv.
<br />Indian Reser.... 237 214 224 272 267
<br />Gila Project ... 559 613 614 666 608
<br />Yuma Project,
<br />Valley Di.... 170 170 155 182 185
<br />Total.................... 966 997 993 1,120 1,060
<br /> Nevada
<br />Pumping from Lake
<br />Mead ........................ jJ J"t "1-1 'IU 01
<br />Mohave Steam Plant.. 9
<br />.rotal...................... 1I 34 41 4{) 76
<br />Grand T etal ...... 5,759 5.877 5,870 6,260 6,393
<br />
<br />Table 3 shows diversions less measured re-
<br />turn flows for the major water users in the
<br />Lower Basin during the past five water years.
<br />As can be seen, Lower Basin use during 1972
<br />increased by 133,000 acre-feet over the previ-
<br />ous year's use.
<br />Table 4 and Plate 6 deal with deliveries to
<br />Mexico. Table 4 shows the annual deliveries
<br />to Mexico since 1962 and includes data on
<br />both total excess deliveries to Mexico and
<br />deliveries which are in excess of control
<br />schedules. These weekly schedules of deliver-
<br />ies to Mexico are made up of estimated re-
<br />turn flows from projects in the Yuma area,
<br />releases from Imperial Dam for sluicing silt
<br />away from the settling basins and river regu-
<br />lation, and additional releases required from
<br />upstream storage. The releases from up-
<br />stream storage are held to the minimum
<br />necessary for the sum of all deliveries to meet
<br />
<br />14
<br />
<br />the United States' commitments for water
<br />delivery pursuant to the Mexican Water
<br />Treaty and the minutes of the International
<br />Boundary and Water Commission. As can be
<br />seen from Table 4, river operation in the past
<br />few years has successfully limited the
<br />amount of excess water delivered to Mexico.
<br />During the early part of 1972, the Chief
<br />Engineer attended several meetings with
<br />representatives of the United States and the
<br />concerned California entities to discuss deliv-
<br />ery of Colorado River water to the City of
<br />Tijuana on an emergency basis. This deliv-
<br />ery would be made through facilities of the
<br />Metropolitan Water District, the San Diego
<br />County Water Authority, _and member agen-
<br />cies of the Authority. Agreements were
<br />reached and culminated by the signing of
<br />Minute No. 240 of the International Bound-
<br />ary and Water Commission on June 13, 1972.
<br />The Minute provides for emergency deliver-
<br />ies for a term not to exceed five years and
<br />which will be accounted as a portion of Mex-
<br />ico's Colorado River water allotted by the
<br />Water Treat) {)f 1911. Ddi,eries begaa ia
<br />mid-August and amounted to 849 acre-feet
<br />during the August and September portion of
<br />the 1972 water year. Deliveries are scheduled
<br />to reach a maximum of 20,600 acre-feet a
<br />year.
<br />
<br />Table -4
<br />DELIVERIES TO MEXICO
<br />COLORADO RIVER SYSTEM
<br />1962 thraugh 1972
<br />(Thausands af Acre-Feet)
<br />
<br />Warer
<br />Year
<br />
<br />Sch<dul<d
<br />Deliveries
<br />to
<br />Alexico .
<br />
<br />Excess
<br />DeliYeri~s
<br />ro
<br />Mexico
<br />
<br />Excess
<br />OYCT
<br />Control
<br />Schedule
<br />
<br />Conrrol
<br />Sch<du/e
<br />
<br />Flow co
<br />M~xico
<br />
<br />1962 ..__.._.._
<br />1963
<br />1964 _..__....,
<br />1965 ....___m
<br />1966 ......_.._
<br />1967 ..........
<br />1968 ,........_
<br />1969 _.._..'m
<br />1970 ..........
<br />1971 ..........
<br />1972 m......_
<br />
<br />1,763
<br />2,113
<br />1,776
<br />1,594
<br />1,720
<br />1.566
<br />1.563
<br />1,551
<br />1,566
<br />1,561
<br />1,601
<br />
<br />n.
<br />
<br />263
<br />613
<br />276
<br />120
<br />179
<br />107
<br />75
<br />59
<br />90
<br />60
<br />85
<br />
<br />223
<br />24{)
<br />227
<br />91
<br />88
<br />49
<br />22
<br />6
<br />38
<br />8
<br />
<br />1,500
<br />1,500
<br />1,500
<br />1,474
<br />1,541
<br />1,459
<br />1,488
<br />1,491
<br />1,476
<br />1,501
<br />1,516--
<br />
<br />1,540
<br />1,873
<br />1,549
<br />1.502
<br />1.632
<br />1.517
<br />1,541
<br />1,545
<br />1,528
<br />1,553
<br />.n
<br />
<br />. Th~ wat~r y~ar total of scheduled delivcries is not necessarily the 1,500"
<br />000 acr~.foot cal~ndar year obligation und~T tbe M~J:ican Water Treaty.
<br />.. Includ~s 849 acre.f~et for dcliveries 10 City of Tijuana under provision.s
<br />of Minute No. 240 ofth~ International Boundary and Watcr Commission.
<br />... Control Schedule values not availablc for 1972 water y~ar.
<br />
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